Window stop



FIG. 1 is a view in perspective showing my new design for a window stop.

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view, the left side view being the mirror image thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view. 

I claim the ornamental design for a window stop, as shown and described. 